8 BULLETIN 981, U. S. DEPARTMENT OF AGRICULTURE. 



per acre." Tests at the field stations at Chillicothe and Amarillo, 

 Tex., have always shown that Sudan grass is superior to Tunis grass 

 in those localities. 



Tunis grass seems best adapted to a region where the period of 

 heaviest rainfall coincides with that of the higher temperatures. It 

 is possible that it might have some value in a locality having wet 

 and dry seasons. If the temperatures were high enough during the 

 wet part of the year Tunis grass might make a good pasture grass 

 and reseed itself indefinitely. 



Tunis grass crosses freely with the sorghums, and some of these 

 natural crosses appear more valuable than the pure strain. This 



Fig. 5. — Tunis grass grown in rows 40 inches apart at the Arlington Experimental Farm, Va. Photo- 

 graphed August 26, 1915. 



grass apparently has only two points of superiority over Sudan grass; 

 it is a few days earlier in reaching maturity and is less subject to 

 the attacks of red-spot, or sorghum blight. These two characters 

 if they are transmitted to the hybrids with sorghum may give to 

 such hybrids a superiority over the Sudan-sorghum crosses. 



KAMERUN GRASS. 



The first introduction into the United States of Kamerun grass 

 (Andropogon sorghum effusus Hackel) was S. P. I. No. 38005, re- 

 ceived April 13, 1914. This was obtained by P. H. Dorsett, near 

 Bahia, Brazil, in which country it is rather widely distributed. A 

 second shipment of seed, S. P. I. No. 38670, was received on July 

 1, 1914, from Dr. T. A. Argolla Ferrao, Bahia, Brazil. In Brazil 



